games101lab7

GAMES101LAB7

这次实验卡了很久啊，难QAQ，最后许多代码都是在别人博客上抄的（难绷

任务一：迁移代码并完成CastRay

首先需要迁移代码，将上节课完成的代码迁移过来

然后完成castray

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// Implementation of Path Tracing

Vector3f Scene::castRay(const Ray &ray, intdepth) const

{

    auto hitObj =intersect(ray);

    if (!hitObj.happened) return {};

    returnshade(hitObj,-ray.direction);

}

然后完成多线程加速，也就是将渲染分块进行，修改render下。

为了方便得到不同的spp结果可以自行传入spp和文件名

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void Renderer::Render(const Scene&scene,intspp, std::string&file_name)

{

    std::vector<Vector3f>framebuffer(scene.width*scene.height);


    float scale =tan(deg2rad(scene.fov*0.5));

    float imageAspectRatio =scene.width/ (float)scene.height;

    Vector3f eye_pos(278, 273, -800);


    int m =0;

    g_complateTotals =0;


    std::cout <<"SPP: "<< spp <<"\n";


    int numThreads = std::thread::hardware_concurrency();

    int lines =scene.height/ numThreads +1;

    std::vector<std::thread> wokers;

    for (int i =0; i < numThreads; i++)

    {

        int y0 = i * lines;

        int y1 = std::min(y0 + lines,scene.height);

        std::cout <<"id:"<<i <<""<< y0 <<"=>"<< y1 << std::endl;

        wokers.push_back(std::thread(render_thread,std::ref(framebuffer),std::ref(scene),spp,y0,y1));

    }


    for (int i =0;i<wokers.size();i++)

    {

        wokers[i].join();

    }

   


    UpdateProgress(1.f);


    // save framebuffer to file

    // FILE* fp = fopen("binary512.ppm", "wb");

    FILE* fp =fopen(file_name.c_str(), "wb");

    (void)fprintf(fp, "P6\n%d%d\n255\n", scene.width, scene.height);

    for (auto i =0; i <scene.height*scene.width; ++i) {

        staticunsignedcharcolor[3];

        color[0] = (unsignedchar)(255* std::pow(clamp(0, 1, framebuffer[i].x), 0.6f));

        color[1] = (unsignedchar)(255* std::pow(clamp(0, 1, framebuffer[i].y), 0.6f));

        color[2] = (unsignedchar)(255* std::pow(clamp(0, 1, framebuffer[i].z), 0.6f));

        fwrite(color, 1, 3, fp);

    }

    fclose(fp);  

}

不同spp结果

这里只取了16、512、2048展示

spp=16
spp=1512
spp=2048

时间和spp成正比，其中16版本花费207s

任务二：完成MICROFACE

这里几乎就是纯copy了，详情见GAMES101作业7及课程总结（重点实现多线程加速，微表面模型材质）

不过不知道为什么我的lambda总是报错，于是把它变成成员函数了

结果对比一下(spp都等于16)

diffuse
MICROFACE